<template>
  <div class="ebook-slide-contents">
    <!-- 搜索框 -->
    <div class="slide-contents-search-wrapper">
      <div class="slide-contents-search-input-wrapper">
        <div class="slide-contents-search-icon">
          <span class="icon-search"></span>
        </div>
        <input
          type="text"
          class="slide-contents-search-input"
          :placeholder="$t('book.searchHint')"
          v-model="searchText"
          @click="showSearchElement()"
          @keyup.enter.exact="search()"
          @keydown.esc.exact="hideSearchElement()"
        />
      </div>
      <div
        class="slide-contents-search-cancel"
        v-if="searchVisible"
        @click="hideSearchElement()"
      >
        {{ $t('book.cancel') }}
      </div>
    </div>

    <div class="slide-contents-book-wrapper" v-show="!searchVisible">
      <!-- 电子书封面 -->
      <div class="slide-contents-book-img-wrapper">
        <img :src="cover" alt="电子书封面" class="slide-contents-book-img" />
      </div>
      <!-- 书名、作者名/译者名 -->
      <div class="slide-contents-book-info-wrapper">
        <div class="slide-contents-book-title">
          <span class="slide-contents-book-title-text">
            {{ metadata.title }}
          </span>
        </div>
        <div class="slide-contents-book-author">
          <span class="slide-contents-book-author-text">
            {{ metadata.creator }}
          </span>
        </div>
      </div>
      <!-- 电子书观看进度 -->
      <div class="slide-contents-book-progress-wrapper">
        <div class="slide-contents-book-progress">
          <span class="progress">{{ progress + '%' }}</span>
          <span class="progress-text">{{ $t('book.haveRead2') }}</span>
        </div>
        <div class="slide-contents-book-time">{{ getReadTimeText() }}</div>
      </div>
    </div>

    <!-- 电子书章节目录 -->
    <Scroll
      class="slide-contents-list"
      :top="168"
      :bottom="48"
      ref="scroll"
      v-show="!searchVisible"
    >
      <div
        class="slide-contents-item"
        v-for="(item, index) in navigation"
        :key="index"
      >
        <span
          class="slide-contents-item-label"
          :class="{ selected: section === index }"
          :style="contentItemStyle(item)"
          @click="displayNavigation(item.href)"
        >
          {{ item.label }}
        </span>
        <span class="slide-contents-item-page">{{ item.page }}</span>
      </div>
    </Scroll>

    <!-- 搜索结果列表 -->
    <Scroll
      class="slide-search-list"
      :top="66"
      :bottom="48"
      v-show="searchVisible"
    >
      <div
        class="slide-search-item"
        v-for="(item, index) in searchList"
        :key="index"
        v-html="item.excerpt"
        @click="displaySearch(item.cfi, true)"
      ></div>
    </Scroll>
  </div>
</template>

<script>
import { ebookMixin } from '@/utils/mixin';
import Scroll from '../common/Scroll.vue';
import { px2rem } from '@/utils/utils';

export default {
  mixins: [ebookMixin],
  components: { Scroll },
  data() {
    return {
      // #控制[取消搜索元素]是否隐藏
      searchVisible: false,
      searchList: null,
      searchText: '',
    };
  },
  methods: {
    // 展示搜索元素
    showSearchElement() {
      this.searchVisible = true;
    },
    // 隐藏搜索元素
    hideSearchElement() {
      this.searchVisible = false;
      this.searchText = '';
      this.searchList = null;
    },
    // 二级标题缩进
    contentItemStyle(item) {
      return {
        marginLeft: `${px2rem(item.level * 15)}rem`,
      };
    },
    // 渲染目录导航页
    displayNavigation(target) {
      this.display(target, () => {
        this.hideTitleAndMenu();
      });
    },

    // 全文搜索
    doSearch(q) {
      return Promise.all(
        this.currentBook.spine.spineItems.map((section) =>
          section
            .load(this.currentBook.load.bind(this.currentBook))
            .then(section.find.bind(section, q))
            .finally(section.unload.bind(section))
        )
      ).then((results) => Promise.resolve([].concat.apply([], results)));
    },

    // 搜索框结果
    search() {
      if (this.searchText && this.searchText.length > 0) {
        this.doSearch(this.searchText).then((list) => {
          this.searchList = list;
          this.searchList.map((item) => {
            item.excerpt = item.excerpt.replace(
              this.searchText,
              `<span class="content-search-text">${this.searchText}</span>`
            );
            return item;
          });
        });
      }
    },

    // 点击搜索结果渲染电子书并且隐藏标题栏和菜单栏
    displaySearch(target, highlight = false) {
      this.display(target, () => this.hideTitleAndMenu());
      // 将文字进行高亮显示
      if (highlight) {
        this.currentBook.rendition.annotations.highlight(target);
      }
    },
  },
};
</script>

<style scoped lang="scss">
@import '../../assets/styles/global';
.ebook-slide-contents {
  width: 100%;
  font-size: 0;
  .slide-contents-search-wrapper {
    display: flex;
    width: 100%;
    height: px2rem(36);
    margin: px2rem(20) 0 px2rem(10) 0;
    padding: 0 px2rem(15);
    box-sizing: border-box;
    .slide-contents-search-input-wrapper {
      flex: 1;
      @include center;
      .slide-contents-search-icon {
        flex: 0 0 px2rem(28);
        font-size: px2rem(12);
        @include center;
      }
      .slide-contents-search-input {
        flex: 1;
        width: 100%;
        height: px2rem(32);
        font-size: px2rem(14);
        background: transparent;
        border: none;
        &:focus {
          outline: none;
        }
      }
    }
    .slide-contents-search-cancel {
      flex: 0 0 px2rem(50);
      font-size: px2rem(14);
      @include right;
    }
  }
  .slide-contents-book-wrapper {
    display: flex;
    width: 100%;
    height: px2rem(90);
    padding: px2rem(10) px2rem(15) px2rem(20) px2rem(15);
    box-sizing: border-box;
    .slide-contents-book-img-wrapper {
      flex: 0 0 px2rem(45);
      .slide-contents-book-img {
        width: px2rem(45);
        height: px2rem(60);
      }
    }
    .slide-contents-book-info-wrapper {
      flex: 1;
      padding: 0 px2rem(10);
      box-sizing: border-box;
      .slide-contents-book-title {
        // width: px2rem(153.75);
        font-size: px2rem(14);
        line-height: px2rem(16);
        @include left;
        .slide-contents-book-title-text {
          @include ellipsis2(3);
        }
      }
      .slide-contents-book-author {
        // width: px2rem(153.75);
        font-size: px2rem(12);
        line-height: px2rem(14);
        margin-top: px2rem(5);
        @include left;
        .slide-contents-book-author-text {
          @include ellipsis2(1);
        }
      }
    }
    .slide-contents-book-progress-wrapper {
      flex: 0 0 px2rem(70);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: flex-start;
      .slide-contents-book-progress {
        .progress {
          font-size: px2rem(14);
        }
        .progress-text {
          font-size: px2rem(12);
        }
      }
      .slide-contents-book-time {
        font-size: px2rem(12);
        margin-top: px2rem(5);
      }
    }
  }

  .slide-contents-list {
    padding: 0 px2rem(15);
    box-sizing: border-box;
    .slide-contents-item {
      display: flex;
      padding: px2rem(20) 0;
      box-sizing: border-box;
      .slide-contents-item-label {
        flex: 1;
        font-size: px2rem(14);
        line-height: px2rem(16);
        @include ellipsis;
      }
      .slide-contents-item-page {
        flex: 0 0 px2rem(30);
        font-size: px2rem(10);
        @include right;
      }
    }
  }

  .slide-search-list {
    width: 100%;
    padding: 0 px2rem(15);
    box-sizing: border-box;
    .slide-search-item {
      font-size: px2rem(14);
      line-height: px2rem(16);
      padding: px2rem(20) 0;
      box-sizing: border-box;
    }
  }
}
</style>
